Magalia Dam Seismic Retrofit Project – Geotechnical Boring Surveys
Summary
SCH Number
2023060600
Public Agency
Paradise Irrigation District
Document Title
Magalia Dam Seismic Retrofit Project – Geotechnical Boring Surveys
Document Type
NOE - Notice of Exemption
Received
Posted
6/22/2023
Document Description
A total of six borings will be advanced upstream of the Magalia Dam within Magalia Reservoir to determine the foundation conditions of the upstream buttress and to determine the geotechnical properties of the proposed borrow material prior to a separate seismic retrofit project at Magalia Dam. All of the borings will lie outside the underwater footprint of the dam to the northeast of the crest of the dam and will be taken using a drill rig from a barge. The barge will be mobilized and demobilized from the left abutment of the dam under supervision of a biologist. Daily mobilizations to the barge will be completed via a 22- by 7-ft tool boat. The borings will be backfilled with a cement-bentonite grout mixture.
Contact Information
Name
Lynn Coster
Agency Name
Central Valley Regional Water Quality Control Board
Job Title
Senior Environmental Scientist
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
Magalia
Counties
Butte
Regions
Northern California
Cross Streets
Intersection of Skyway and Dogtown Road
Township
23 N
Range
3 E
Section
25
Base
MDB&M
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Title 14, Article 19, Section 15304, Minor Alterations to Land
Reasons for Exemption
This project is Categorically Exempt under CEQA section 15304 because the Project involves minor alterations to land with no removal of healthy, mature, or scenic trees.
County Clerk
Butte
Attachments
Notice of Exemption
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